Question

алгебра помогите пж ​

Answer 1

Ответ:

$\left \{ {{2 x- 7y = 3 \: \: \: | \times 3} \atop {3x + 4y = - 10 \: \: \: | \times 2} } \right. \\ \\ \left \{ {{6x - 21y = 9} \atop {6x + 8y = - 20} } \right. \\ \\ (1) - (2) \\ \\ - 29y = 29 \\ y = - 1 \\ \\ x = \frac{3 + 7y}{2} = \frac{3 - 7}{2} = - 2$

Ответ: (-2;-1)